Vertical breakdown

For vertical breakdown near to an under construction building establish the working reference point which mark define from the nearest reference points state nivelirnoj networks.

In building heights from a conditional zero mark - level of a floor of the ground floor often reckon, thus in the project specify an absolute mark (i.e. From a sea level) a zero mark.

We Will consider on an example as it do. We will admit that level of a zero mark needs to be fixed on obnoske (fig. 113. The absolute mark of a zero point under the project is equal 102,285, and a reference point mark - 104,012. Hence, level of a zero mark below reference point level on 1,727м. To transfer a zero mark in a column 4 old clothes, between it and a reference point place a level 3, on a reference point put rejku 2 and do by a level readout. We will assume that readout on rejke is equal 525мм. Then the mark of horizon of the tool will be 104,012+0,525=104,537. Then calculate a difference between a mark of horizon of the tool and an absolute mark of a zero point: 104,537 - 102,285=2,252м. Readout on rejke, established on a zero mark should give this difference. Vising on rejku, it is established at a column by old clothes so that readout on rejke was 2252мм. Having received this readout, on the bottom end rejki on a column old clothes draw a line which serves as level of a zero mark. For fastening of this level on a column old clothes hammer in the probe or a nail.

At vertical breakdown of buildings from a zero mark conduct all readout downwards and upwards. Marks above conditional level have a plus, more low - a minus. For example, the floor of the second floor of an apartment house will be on a mark plus 3,000, and an input in the house - a minus 0,850.

From a zero mark it is possible to execute easily vertical breakdown of a bottom of a foundation ditch (fig. 113, a sawn-off shotgun of the base, window and doorways, interfloor overlappings, eaves. For this purpose use the design marks specified on drawings of vertical cuts of a building.

a Fig. 113. Crossing of marks by a level :
And - on obnosku, - in a foundation ditch;
1 - a reference point, 2 - rejka, 3 - a level, 4 - a column old clothes, а1, a2 - readout on rejkam, в1, в2 - tool horizon

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